Physics 12th

Physics Class 12th Chapter15 COMMUNICATION SYSTEM VVI Objective Question

Q.1. Sky wave communication is based upon (A) reflection by ionosphere (B) absorption by ionosphere (C) transmission through ionosphere (D) None of these  Ans :- (A)  Q.2. The process opposite to modulation is  (A) demodulation (B) transmission (C) remote sensing (D) fax  Ans :- (A)  Q.3. A net work within an institution is known as  …

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Physics class12 Chapter 11 RADIATION AND DUAL NATURE OF MATTER

Q.1. Electron volt (eV) is the measure of  (A) charge  (B) potential difference  (C) current  (D) energy  Ans :- (D)  Q.2. Dimension of plank constant is  (A) ML²T⁻¹  (B) ML²T⁻² (C) MLT⁻¹  (D) MLT⁻²  Ans :- (A)  Q.3. On the basis of photo electric effect, light is  (A)  Wave  (B) Particle  (C) Both  (D) None …

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Physics class -12th chapter 10 WAVE OPTICS MOST VVI Objective Question

Q.1. The colour of a thin film is due to (A) scattering (B) interference (C) Dispersion (D) diffraction Ans :- (B) Q.2. Brewster’s law is (A) μ=sin ip (B) μ=cos ip (C) μ=tan ip (D) μ=tan² ip Ans :- (C) Q.3. With increase in wavelength the refractive index (A) Increases (B) Decreases (C) Remains unchanged …

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Physics Class 12th Chapter 7 Alternating Current Most VVI Objective Questions

Q.1. The unit of reactance is (A) Ohm (B) Farad (C) Ampere (D) Mho Ans :- (A) Q.2. Impedance of L-R circuit is (A) R+ωL (B) R²+ω²L² (C) √R+ωL (D) √R²+ω²L² Ans:- (D) Q.3. If φ is the phase difference between a.c. current and e.m.f then the value of power factor is (A) tan φ …

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